Air-pump



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AIR PUMP. No. 262,674. Patented Aug. 15,A 1882.

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UNITED STATES PATENT OFFICE.

LEWIS S. HOYT, OF STAMFORD, CONNECTICUT, ASSIGNOR TO I- IIMSELF AND JOHN M. CULVER, OF NORTH ABINGTON, MASSACHUSETTS.

AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. 262,674, dated August 15, 1882.

Application mea May 29, rss2. (No model.)

To all whom it may concern Beit known that LLEWIS S. HOYT,ofSta1n ford, in the county of Fairfield, State of Connecticut, have invented a cert-ain new and useful Improvement in AirPumps, of which the followingis a description sufiiciently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l is an isometrical perspective view of 'the pump proper with its Casin g removed; Fig. 2, a vertical longitudinal section of the pump and tank; Fig. 3, a sectional view showing the method of attaching the rubber to the heads; Fig. 4, an isometrieal perspective view of 'the machine complete; Fig. 5, a sectional view showing the method ot' connecting the rods and rubber, and Fig. 6 a sectional view showing the re-eni'orce ring and rod.

Like letters of reference indicate corresponding parts in the dilerent figures of the drawings.

My invention relates principally to that class of air-pumps which is designed for maintaining an aerostatic pressure in beer-barrels, running dental engines and drills, supplying air to carburetors, 86e.; and it consists in a novel construction and arrangement of parts, as hereinafter more fully set forth and claimed, by which a simpler, cheaper, and more eii'ective device of this character is produced than is now in ordinary use.

In the drawings, A represents the' body or case of the pump; B, the pump proper, and C the reservoir or tank. The reservoir is disposed inthe lower part of the case, and is connected to the pump by the pipes or duets f g h, provided with the three-way cock D and lever fu, to which access is had through the doors or apertures E. A series of rods, a a, arranged in a circle near the Walls of the casing A, connect the head G and bottom H of the pump B; and tted to work vertically on these rods there is a head or piston, K, provided with the upright rack I and rods J, extending through the head G. The piston K and bottom H are connected by the rubber cloth or sheet-rubber L, forming an air-tight 5o accordion-bellows, the cloth being secured to the rods a by a series of rings, x, which slide lup and down on the same as the bellows is worked. The rods J are provided with coiled springs z, which act expansively to assist in forcing down the piston G, the lower ends ot' the springs resting on the top ot' the piston and the upper ends abutting against the under side of the top G within the recesses m lm, formed therein for their reception. Mounted 6o horizontally on the top G and journaled in proper bearings there is a shaft, M, carrying the pinion d, grooved pulleys N, cords i, weights Q, ratchet-wheel b, and gear z, the pinion d intermeshing with the rack I and the gear z with the pinion o on a crank-shaft, P, disposed on the casing A. The piston K and bottom H are respectively provided around their peripheries with a groove, y, to enable the rubber L to be properly secured to the 7o saine, which is accomplished by means of the wire or cord 7c and clamp t, the rubber being also strengthened at the rings cc by the re-en- In the use of my improvement, the piston or follower K being depressed, the ducts g h are opened by the cock D and the duct f closed. The crank P is then turned to wind up the machine or elevate the Weights Q and follower K, causing the air to enter through the ducts 8o g h and ll the bellows or pump B. The duct g is next closed and the duct f opened, after which the pawl of the ratchet b is thrown back, permitting the weights Q to depress the follower K and force the air through the ducts h f into the reservoir or receiver C, after which the duct fis again closed and the ducts h g opened, and the process repeated until the required quantity of air has been forced into the receiver.

A pipe, U, provided with the stop-cock j, connects the reservoir or receiver C with the dentists drill S. When the drill is detached the pipe may also be used for conveying the air from the receiver to a carburetor for the purpose ot' being carbureted, or to a beer-barrel in which it is desired to increase the pressshaft M, pinion d, pulley N, weight Q, ratchet ure on' the beer, or to a blow-pipe for jewelb, gear z, pinion o, crank P, and pipe U, coners or coppersmiths use, 86e. st-rueted, combined, and arranged to operate Having thus explained my invention, what I substantially as and for the purpose set forth 5 claim is and specified.

The improved air-pump desoribed,the same LEWIS S HOYT consisting of the case A, having the receiver' C and pump B, connected by the ducts or Witnesses: pipesfh, and provided with the stop-cook D C. A. SHAW, 1o' and duet g, in combination with the rack I, JAMES M. PALMER. 

